[bailey-mackay] diatoms FROM VANCOUVER ISLAND, B. C. 163 



sis Grev. The horns of uniform width with slight con- 

 vergence are quite different in general appearance from 

 those of any other species. 

 Campylodiscus Thuretii Bréb. v50(50)s2:6:12. 



Campyloneis Grevillei var. Argus Grun. v53(40)s5, v75(63)s5:3.5. 

 Cerataulus polymorphus (Ktz) H.V. z(20 + 35+ ) (60). 

 " turgidus Ehr. 104(88)sl0. 



" " forma major spinifera Peragallo. z(ll + 22 + 68 + 



+ ) (65). 

 Chaetoceros boréale Bail. 



" cryophyllum Castr, zl6(32). 



" crinitum Schutt. 



" decipiens CI. z50(20). 



" didymum CI. z26(18), z50(30). 



" dichaeta (Kendall), 



" Peruvianum Brightw. z33(33), z36(27). 



« saltans CI. z33(37), z35(26). 



" sociale Laud . z9 ( 1 3) , z7 ( 1 1 ) . 



" suUilis CI. z20(35). 



(?) 

 (?) 

 Cocconeis costata Greg. vl6(10)s7, v21(12)s8, v22(13)s6. Common. 

 « " var. Pacifica Grun. Iv23(15)s6 + 



" ctirvi-rotunda Temp. & Peragallo 10. v33 (23)s20, v57(46)s20. 

 dirupta Greg. v22(16)sl7, v33(21)s8, v90(76)sl4, v88(77) 

 sl9. 

 " " var. v75(60)sl4. A wide sigmoid cross with arms 



reaching nearly to the margin is without sculp- 

 ture. 

 " " var.yZexe//a Jan. v24(12)sl7, v27(18)sl8. 



" " " n.v. v72(60)sl6:10. Differs from the first 



variety by having a sigmoid midrib in the 

 centre of the vertical smooth area, and the 

 smooth area of the arms extend to the peri- 

 phery widening to the margin. The rows of 

 dots are about 10 in 10 microns, while the 

 dots run 16 to 10. 

 " distans A.S. vl8(9)s7, v22(12)s9. Three rows on each side 

 of the midrib, and parallel. Veiy like C. 

 parallela following. 

 " n.sp? v38(32)s8-5, v43(39)s6-4. 23 or 24 ribs in each 

 The ribs run into the midrib which is heavier 

 near the centre. The ribs become more 



